In distributed applications based on mobile agents, coordination and synchonization of the actions executed by a team of mobile agents are difficult tasks. The main difficulty comes from the fact that coordination requires the agents to interact with each other in spite of their dynamically changing locations. In this paper we present a mechanism for coordinating mobile agents which handles the problem of locating and addressing members in a group of mobile agents. This mechanism, which we called Broadcast Channel, implements reliable broadcasts of messages to a group of mobile agents, independently of their current locations.